Feeding mechanism for sewing-machines.



PATENTED MAY 5, 1903.

J. KUHLBR.

FEEDING MECHANISM FOR SEWING MACHINES.

APPLIUATION FILED MAY 22. 1899.

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PATENTED MAY 5, 1903.

J. KUHLER. FEEDING MECHANISM FOR SEWING MACHINES.

APPLICATION FILE D MAY 22, 1899.

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PATENT JULIUS KCHLER, OF LIMBACH, GERMANY.

SPECIFICATION forming part of Letters Patent No. 727,384, dated May 5,1903.

Application filed May 22, 1899. Serial No. 717,792. (No model.)

To all whom it may concern:

ing-machine maker, ofLim bach, Saxony, Germany, have invented certainImprovements in Feeding Mechanism for Sewing-Machines; and I do herebydeclare thenature of this invention and in what manner the same is to beperformed to be particularly described and ascertained in andby thefollowing statement.

My said invention relates to an intermittent and positive movementofthefeed-rolls of sewing-machines for joining together hosiery and thelike fabrics bywhich I obtain nearly four times the working speed (up tothree thousand stitches a minute) as compared With machines hitherto.constructed. In combination with this said mechanical movement I haveconstructed a special mechanism to vary the length of stitches, which isabsolutely necessary to enable the machine to be used forsewingdilferentgages of fabric.

In all sewing-machines for selvaged hosiery the fabric to be stitchedpasses between two feed-rolls, and in consequence of this a variablemotion of the said feed-rolls will also cause a various length ofstitches.

In order to clearly describe my said invention, reference is hereinaftermade to the accompanying drawings, in which Figure 1 is a side view withparts in section; Fig 2, a plan View of the parts shown in Fig. 1; Fig.3, a sectional view of a modification; Fig. 4, a plan View of the partsshown in Fig. 3; Fig. 5. a view, similar to Fig. 3, of a furthermodification.

In order to obtain an intermittent and positive motion of the saidfeed-rolls, a wormgearing is used, the worm of which, besides beingcontinuously rotated, can bedisplaced longitudinally on its shaft. Onepart of this longitudinal motion, from the left to the right, isactuated very quickly. It turns the said feed-rolls to the extent ofthelength of one stitch. The other part of this said longitudinalmotion, from the rightto the left back again, is actuated very slowlyand causes the worm-wheel to remain stationary. During this time thestitch-forming parts of the machine are operated to form the stitch. Inorder to obtain a high speed, it is necessary to have all motions of apositive nature and to simplify the construction as much as possible. Ihave therefore directly connected the worm g with the eccentric g, sothat both form one solid piece.

In order to make the worm g, Figs. 2 and 4, slide longitudinally on itsshaft 9 the worm and the eccentric g, directly fixed to the said Worm,have a splined connection with their shaft and a pin h, the stud ofwhich is directly fastened to the plate of the machine,

catches in the said eccentric groove g. The shaft 9 of the worm. and thesaid eccentric derives a continuous rotation from the main shaft 70,Fig. 1, by means of the equally large worm-wheels m m Fig. l, and nr'fi,Fig. 2, so that the worm g makes exactly the same number of revolutionsper minute as the main shaft 70. As the worm g is directly connectedwith the eccentric g, the said eccentric must thus have the samerotation as the said worm g, and the said worm g with the said eccentricg are slid to and fro on their shaft 9 at every revolution of the mainshaft k. Because one part of the longitudinal movement of the worm 9causes the worm-wheel cl to remain stationary this rotation of the saidworm-wheel d is stopped regularly at each revolution of the main shaft7a to allow the needle to penetrate the fabric and the stitch-formingmechanism to form the stitch. As this operation requires some time, itis necessary that during one revolution of the main shaftk theworm-wheel (Z, and in combination with it the feed-rolls of the machine,should remain stationary a longer time than is required to move the saidfeed-rolls to the extent of the length of one stitch. This arrest of theworm-wheel dis depending of the form of the eccentric 9, Fig. 2, withoutinfluencing the regularity of the intermittent movement of the saidfeed-rolls. By the means just described I obtain a regular intermittentmotion of the said feed-rolls,which also is of a positive nature.

In combination with this aforesaid mechanism or mechanical movement ofthe feedrolls of sewing-machines I'have constructed a special mechanismto vary the length of stitches to enable the machine for sewingdifferent gages of fabric.

The Worm-wheel d, Figs. 1 and 2, does not directly impart its motion tothe back feedroll a, Fig. 1, but is connected with a cogwheel t,whichimparts the motion of the wormgearing g d to the shaft 0 of the saidback feed-roll a by means of the gearing s and r, Fig. 5. The gear 8,Fig. 5, is fixed to a lever M, Fig. 4, which can be turned on the pivotof the worm-wheel cl. In order to always remain in its right positionand to obtain the proper gear of the cog-wheels s and r, Fig. 5, thesaid lever u is fastened on its other end by a thumb-screw p. Whenaltering the stitch, the cog-wheel r, Fig. 5, must be taken otf'to bereplaced by another one, and the lever u must be turned according to thesize of the cog-wheel r to allow the cog-wheels s to gear with this saidwheel '2".

Instead of taking the wheel 1' oif and replacing it by another one thefollowing two ways of simplification are possible:

First, on the shaft 0 of the-back feed-roll a, Figs. 1 and 2, three ormore cog-Wheels r r 4", connected to each other and ofdifferentdiameters, are mounted so that they can be displaced higher orlower. Each of these cogwheels 1" r r may be provided with a ring or dieq. The lever a in this case is provided with a projection u, and insteadof being kept in position by a thumb-screwp, Fig. 4, it may be pressedby means of a spring a on the disk or ring q of the then acting wheel'1" r W, so giving the exact distance between this acting wheel 4" r rand the pinion .9. When altering the length of stitch, the cogwheels 1"r r must be placed in such a'position that the pinion or gear 8 gearswith the wheel at the time required. The spring a presses the lever 21,and the gear 3, which is mounted on said lever tt, always in the rightposition, so that never too much nor too little friction is caused,because the projection u of the said lever it, sliding on the ring ordisk q of the acting wheel "I" or r r fixes the distance of the gearing.

Second. Three or more cog-wheels 1" 7* r Figs. 3 and 4, are fastenedsteady to the shaft 0 of the back feed-roll a, so that the largest wheelis at the top. The pinion or gear 3 in this case is displaceable on itsshaft and is made just as broad as the wheels 7" r r on the shaft 0together. This said pinion s rotates around a bar 8, the position ofwhich as regards being placed higher or lower may be altered on the boltof the lever 11.. If it is required to change the stitch, thethumb-screw 19, Fig. 4, is loosened and the lever u is placed aside asfar as it is required to allow the pinion 8 to be placed so that it willgear with the acting wheel r or 1" r Having done so, the lever u isfastened again. The pinion 3 being as thick as the cog-wheels r r rtogether, the gearing cannot get lost.

By the construction and arrangement of parts hereinbefore described allthe motions are of a positive nature. There is thus no dependence onsprings or their resilient action, and as a consequence a very highspeed and a quiet and steady action are attainable.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is 1. In combination, the feed-rolls of a sewing-machine, acontinuously-rotating worm g which is also longitudinally movable on itsshaft, a worm-wheel d gearing with the said worm, 850., connectionsbetween the worm and the feed-rolls and an eccentric g directlyconnected with the said worm, the worm and said eccentric having asplined connection with their shaft, means for driving the shaft, and apin h for moving the worm longitudinally on its shaft, to impart apositive intermittent motion to the feed-rolls of sewingmachines,substantially as described.

2. In combination, the feed-rolls of a sewing-machine, acontinuously-rotating worm g which is also longitudinally movable on itsshaft, a worm-wheel d gearing with the said worm, 850., connectionsbetween the worm and the feed-rolls, and an eccentric g directlyconnected with the said worm, the worm and said eccentric having asplined connection JULIUS KoI-ILER.

Witnesses:

EUGEN NUBUL, J. G. MONAGHAN.

